Grease-gun.



W. s. STAPLBY.

GREASE GUN. APPLICATION FILED amigas, 1008.

Fig. 4: a similar view y UNITED sTATns PATENT onirica.

WILLIAM S. STAPLEY, OF BRIDGEPORT, CONNECTICUT, ASSIGNOR TO BRIDGEPORTBRASS COMPANY, OF BRIDGPORT, CONNECTICUT, A CORPORATION OF CONNECTICUT.

GREASE-GUN.

Specification of Letters Patent.

resented March 16, 1909.

Application led September 26, 1908. Serial No. 454,905.

To all whom it may concern:

Be it known that I, WILLIAM S. STAPLEY, a citizen of the United States,residing at Bridgeport, county of Fairfield, State of Connecticut, haveinvented a new and useful Grease-Gun, of which the following is aspecification.

This invention has for its' ob'ect to rovide a grease gun, so. called, wich s all be adapted for use with either hard or soft grease or oil,which will eject the grease by means of a screw-actuated piston andwhich shall be so constructed that when the piston reaches the extremeof its inward movement the screw will be automatically disconnected sothat the piston may be retracted by longi-,

tudinal movement of the screw' and when used with hard grease the piston`will be raised by the cakes of grease as they are cut out by the end ofthe cylinder.

With these and other objects in view I have devised the novel grease gunof which the following description in connection with the accompanyingdrawing is a specification, reference characters being used to indicatethe several arts.

Figure l 1s a view partly -in elevation and partly in longitudinalsection, illustrating my. novel grease gun with the piston retracted andthe cylinder filled with soft grease or oil; Fig. l2 a rear end view ofthe cylinder with the screw in section on the line 2-'2 in Fig. 1,lookin in the direction of the arrow; Fig. 3 a-- simi ar view with thecap removed, the cam disk appearing in plan;

with the cam disk removed, the carrying plate, slides and dogs appearingini-plan; Fig. 5 a,v plan view Vof the carrying plate detached; Figf asection of the cap, cam disk, carrying plate and dogs on the line 6-6 inFigs. 2 and 4; Fig. 7 a sectionon the line 7-7 in Fig. 2; and Fig. 8

is a view partly in elevation and partly in section, illustratin theoperation of loading the cylinder with ard grease.

10 denotes the cylinder which is provided with a suitable nozzle 11which may be either curvedor straight as indicated res ectively by fulland dotted lines in Fig. 1.

n order to adapt the gun for use with hard grease, the outer ordischarge end of the cylinder is provided with a removable cap,

vindicated by 12, to which the nozzles are removably secured.

13 denotes the pistonwhich is pivotally WJ19 through which the screwpasses free secured to a screw 14. In order to prevent the possibilityof leakage and to insure effectiveness in use, I preferably use a pistoncomprising reversed cup-shaped flexible washers 15 and inner and outermetallic washers 16 which are retained on the end of a screw by means ofa nut 17, leaving the screw free to rotate independently of vthe piston.At the base or inner end of the cylinder is a cap 18 having a centralopenin y an( arc-shaped slots' 20.

. 21 denotes'an oscillatory cam disk which lies in a recess 25 in the cain which it rotates freely, is provided wit a central opening 22 throughwhich the screw passes freely, with cam slots 23 and with operating pins24 which extend through the arc-shaped slots in the cap. Y

26 denotes a retaining plate which engages the shoulder 27 in the baseof the cap outside recess 25 and isI secured to the cap as by rivets 28.The retaining plate is provided with a transverse groove 29, with acentral opening 30 and with slots 3 1 in alinement lwith the groovewhich lead into the central opening.

32 denotes slides which are adapted to reciprocate in groove 29 and areprovided with lugs 33 which engage cam slots 23 inthe cam disk and withdogs 34 which lie in slots 31 in the retaining plate and engage thethread of the screw, as clearly shown in Fig. 6. Both the lugs and thedogs may be struck out and formed from the metal of the slides, asclearly shown. v

35denotes a cross piece at the outer end of the screw for convenience inoperation and to engage operating pins 24 on the cam disk to oscillatethe latter and draw the dogs out of engagement with the thread of thescrew when the piston is at the eXtreme of its forward movement.

The operation is as follows: Suppose the un to be loaded with oil orsoft grease, as in "ig. 1, and the dogs to bein engagement with thethread of the screw. Forward rotation of the screw by means of the crossiece will force the piston forward and cause t e grease to bedischarged, from the nozzle. When the screw has been turned entirely inand the piston is at the forward end of the cylinder, the cross piecewill engage the operating pins and pressure upon the cross piece willmove the pins backward in the arc-slots in the cap,

Hdrawing the dogs from engagement with thethereby oscillating the camdisk and withserting the nozzle into oil or grease in a receptacle anddrawing the piston backward in the same manner that a piston syringe isfilled. When the cylinder is partly or Wholly lled with oil or softgrease, to discharge the rease the operator oscillates the' cam disk ypressure on the operating pins and places the dogs in engagement withthe thread of the screw. The oil 'or grease may then be forced out byforward rotation of the screw by means of the cross piece until thecylinder Ais emptied and the dogs are again withdrawn by thecross'piecefrom engagement with the thread of the screw.

To fill the cylinder with hard grease, the operator removes cap 12 fromthe discharge end of the cylinder and presses the o en end of thecylinder into the grease, whidli is indicated by 36 in Fig. 8, the endof the cylin- A clearly shown in der acting to out out cakes of thegrease, which are indicated by 37. As each cake is cutout it lifts thecakes previousl cut out and the piston u ward in the cy der, as ig. 8.The operation in discharging hard grease is the'same as in dischargingsoft' grease or oil. The dogs are moved in to engagement with the threadof the screw and, cap 12 and the nozzle being in place, .the grease isdischarged through the nozzle by forward rotation of the screw.

1 I-Iaving thus described my -invention I c ann:

1. A grease gun comprising a cylinder, a-

piston, a screw by which the piston is oarried, dogs adapted to engagethe thread of the screw, slides by which the-dogs are carried, aretaining plate having a transverse groove in which the slidesreciprocate and an oscillatory cam disk by vwhich the slides :areoperated.

2. A grease gun comprising a cylinder, a piston, a screw by which theiston is carried,

slides provided with dogs a apted to engage the thread of the screw, andwith lugs, and

an oscillatory disk having cam slots engaged by the lugs.

3. A grease gun comprising a cylinder, a piston, a screw y which theiston is carried,

slides provided with dogs a apted to engage the thread of the screw andwith lugs, and an oscillatory disk having cam. slots engaged by the lugsand operating pins extending from said disk.

4. A grease gun comprising -a cylinder inner side and arc slots, apiston, a screw by.- which the piston is carried, an oscillatory.

disk lying in the recess and having cam slots and operating .pinsextending through the arc slots, slides having lugs engaging the camslots and dogs adapted to engage the thread of the` screw, and aretaining plate -secured to the cap and havin a transverse recess andslots to receive the s 'des and do s.

6. `A grease gun comprising a cylin er having at its base a cap with arcslots, a piston, a screw by which the piston is carried and which isprovided at its outer end with a cross piece, an oscillatory disk havingcam slots and operating pins extending throu h the arc slots, slideshaving lugs engaging t e cam slots and dogs ada ted to be moved intoengagement with the t read of the screw by the disk and operating pins,said pins being adapted to be engaged y the cross piece to 'disconnectthe screw when the piston has reached the extreme of its inwardmovement.

7. A grease gun comprising a cylinder, a piston, a screw by which thepiston is carried and which is4 rovided with a cross piece, slideshaving ogs adapted to engage the thread of the screw and lugs, anoscillatory disk having cam. slots engagedby the lugs andvoperating pinsby which the dogs may be moved into engagement with the thread of thescrewand which are engaged by the cross piece to disconnect the screw atthe-end of the forward movement of the piston. A

8. A grease gun comprising a cylinder having at its outer end aremovable cap and nozzle, a piston, a screw by which the iston iscarried, dogs adapted to engage the t read of the screw and means formovingthe dogs into and out of en agement, so that when the cap isremoved and the dogs are disenga ed, cakes of hard grease'may be cut outy the 'end of the cylinder, each cake raisingthose previously cut outand the piston, and when the cap and nozzle are in place andthe dogsengaged the grease may e forced out by rotation ofthe screw.

In testimony whereof I afhx my signature, in presence of two witnesses.

WILLIAM S. STAPLEY.

Witnesses:

ARTHUR H. MOORE, ISAAC L. FERRIS.

